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post #1 of 4 Old 09-01-2014, 02:58 PM Thread Starter
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Join Date: Sep 2014
Location: brooklyn
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I just bought a 2004 jeep grand cherokee. The 4x4 is on hi should that stay in neutral at all times till i decide i need it? and how do i turn it on when i need. Just bought this still a rookie. Car sales man said to keep it on at all times but i feel that will deflate my fuel mileage.. Please help..

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post #2 of 4 Old 09-01-2014, 03:10 PM
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2004 WJ 
Join Date: Feb 2011
Location: Bognor
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If you put out in Neutral it won't move! Assuming it's a quadratrack or quadradrive you just leave out in 4hi all the times unless you go serious off roading.

If you can't fix it with a hammer, you've got yourself an electrical problem!
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post #3 of 4 Old 09-01-2014, 03:10 PM
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2011 JK Wrangler 
Join Date: Oct 2008
Location: Michigan
Posts: 6,190
Its an automatic mechanical system. When the shifter is in hi, it is actually rear wheel drive until it the rears start spinning faster than the front. That will cause pressure build up in the transfer case and transfer power to the front wheels. It is a progressive system and can send as much power as is needed to the front or rear until they are spinning at the same speed. Fuel mileage would not change at all, even if you did have a dedicated 2wd mode since our axles are "live" in that you can not disengage the hubs, so everything in the axle is always turning and creating friction.

In lo mode, it lowers the gear ratio for more torque, and physically locks the front and rear drive shafts together so that they are always spinning at the exact same speed. Never Ever Ever use this mode on dry pavement.

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post #4 of 4 Old 09-01-2014, 03:15 PM Thread Starter
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Wow Thank you for such quick replies. yes i was not sure.. Thank you again...
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